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"""Helper library for repacking GKI boot images."""
import os
import shutil
import subprocess
import tempfile
from treble.fetcher import fetcher_lib
def fetch_bootimg(client, out_dir, build_id, kernel_version, target):
"""Fetches boot.img artifacts from a given build ID."""
fetcher_lib.fetch_artifacts(
client=client,
build_id=build_id,
target=target,
pattern=r'(gsi_.*-img-.*\.zip|gsi_.*-target_files-.*\.zip|boot-debug-{version}.*\.img|boot-test-harness-{version}.*\.img|otatools.zip)'
.format(version=kernel_version),
out_dir=out_dir)
def fetch_kernel(client, out_dir, build_id, kernel_target, kernel_debug_target):
"""Fetches kernel artifacts from a given build ID."""
kernel_dir = os.path.join(out_dir, 'kernel')
kernel_debug_dir = os.path.join(out_dir, 'kernel_debug')
os.makedirs(kernel_dir)
os.makedirs(kernel_debug_dir)
fetcher_lib.fetch_artifacts(
client=client,
build_id=build_id,
target=kernel_target,
pattern=r'(Image|Image.lz4|System\.map|abi_symbollist|vmlinux)',
out_dir=kernel_dir)
fetcher_lib.fetch_artifacts(
client=client,
build_id=build_id,
target=kernel_debug_target,
pattern=r'(Image|Image.lz4|System\.map|abi-generated.xml|abi-full-generated.xml)',
out_dir=kernel_debug_dir)
print('Compressing kernels')
def compress_kernel(kernel_path):
zipped_kernel_path = os.path.join(os.path.dirname(kernel_path), 'Image.gz')
with open(zipped_kernel_path, 'wb') as zipped_kernel:
cmd = [
'gzip',
'-nc',
kernel_path,
]
print(' '.join(cmd))
subprocess.check_call(cmd, stdout=zipped_kernel)
compress_kernel(os.path.join(kernel_dir, 'Image'))
compress_kernel(os.path.join(kernel_debug_dir, 'Image'))
return kernel_dir, kernel_debug_dir
def _replace_kernel(bootimg_path, kernel_path):
"""Unpacks a boot.img, replaces the kernel, then repacks."""
with tempfile.TemporaryDirectory() as unpack_dir:
print('Unpacking bootimg %s' % bootimg_path)
cmd = [
'out/host/linux-x86/bin/unpack_bootimg',
'--boot_img',
bootimg_path,
'--out',
unpack_dir,
'--format',
'mkbootimg',
]
print(' '.join(cmd))
mkbootimg_args = subprocess.check_output(cmd).decode('utf-8').split(' ')
print('Copying kernel %s' % kernel_path)
shutil.copy(kernel_path, os.path.join(unpack_dir, 'kernel'))
print('Repacking with mkbootimg')
cmd = [
'out/host/linux-x86/bin/mkbootimg',
'--output',
bootimg_path,
] + mkbootimg_args
print(' '.join(cmd))
subprocess.check_call(cmd)
def repack_bootimgs(bootimg_dir, kernel_dir, kernel_debug_dir):
"""Repacks all boot images in a given dir using the provided kernels."""
for bootimg_path in os.listdir(bootimg_dir):
bootimg_path = os.path.join(bootimg_dir, bootimg_path)
if not bootimg_path.endswith('.img'):
continue
kernel_name = 'Image'
if '-gz' in bootimg_path:
kernel_name = 'Image.gz'
elif '-lz4' in bootimg_path:
kernel_name = 'Image.lz4'
kernel_path = os.path.join(kernel_dir, kernel_name)
if bootimg_path.endswith('-allsyms.img'):
kernel_path = os.path.join(kernel_debug_dir, kernel_name)
_replace_kernel(bootimg_path, kernel_path)
def repack_img_zip(img_zip_path, kernel_dir, kernel_debug_dir, kernel_version):
"""Repacks boot images within an img.zip archive."""
with tempfile.TemporaryDirectory() as unzip_dir:
# TODO(b/209035444): 5.15 GSI boot.img is not yet available, so reuse 5.10 boot.img
# which should have an identical ramdisk.
if kernel_version == '5.15':
kernel_version = '5.10'
pattern = 'boot-{}*'.format(kernel_version)
print('Unzipping %s to repack bootimgs' % img_zip_path)
cmd = [
'unzip',
'-d',
unzip_dir,
img_zip_path,
pattern,
]
print(' '.join(cmd))
subprocess.check_call(cmd)
repack_bootimgs(unzip_dir, kernel_dir, kernel_debug_dir)
cmd = [
'zip',
img_zip_path,
pattern,
]
print(' '.join(cmd))
subprocess.check_call(cmd, cwd=unzip_dir)
def replace_target_files_zip_kernels(target_files_zip_path, kernel_out_dir,
kernel_version):
"""Replaces the BOOT/kernel-* kernels within a target_files.zip archive."""
with tempfile.TemporaryDirectory() as unzip_dir:
pattern = 'BOOT/kernel-{}*'.format(kernel_version)
print(
'Unzipping %s to replace kernels in preparation for signing' %
target_files_zip_path,)
cmd = [
'unzip',
'-d',
unzip_dir,
target_files_zip_path,
pattern,
]
print(' '.join(cmd))
subprocess.check_call(cmd)
for kernel in os.listdir(kernel_out_dir):
if kernel.startswith('kernel-{}'.format(kernel_version)):
print('Copying %s' % kernel)
shutil.copy(
os.path.join(kernel_out_dir, kernel),
os.path.join(unzip_dir, 'BOOT'))
cmd = [
'zip',
target_files_zip_path,
pattern,
]
print(' '.join(cmd))
subprocess.check_call(cmd, cwd=unzip_dir)
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